package com.atguigu.gulimall.cart.interceptor;

import com.atguigu.common.constant.AuthServerConstant;

import com.atguigu.common.constant.CartConstant;
import com.atguigu.common.vo.MemberRespVo;
import com.atguigu.gulimall.cart.vo.UserInfTo;
import org.apache.commons.lang.StringUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

/**
 * 在执行目标方法之前，判断用户的登录状态
 */
public class CartInterceptor implements HandlerInterceptor {

    public static ThreadLocal<UserInfTo> threadLocal = new ThreadLocal<>();

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HttpSession session = request.getSession();
        MemberRespVo memberRespVo = (MemberRespVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
        UserInfTo userInfTo = new UserInfTo();
        userInfTo.setUserId(1L);
        if (memberRespVo != null) {
            //用户登录
//            userInfTo.setUserId(memberRespVo.getId());
            userInfTo.setUserId(1L);
        }
        Cookie[] cookies = request.getCookies();
        if (cookies!=null && cookies.length > 0){
            for (Cookie cookie: cookies){
                String name = cookie.getName();
                if (name.equals(CartConstant.TEMP_USER_COOKIE_NAME)){
                    userInfTo.setUserKey(cookie.getValue());
                    userInfTo.setTempUser(true);
                }
            }
        }
        //如果没有临时用户，分配一个临时用户
        if (StringUtils.isEmpty(userInfTo.getUserKey())){
            String uuid = UUID.randomUUID().toString();
            userInfTo.setUserKey(uuid);
        }
        threadLocal.set(userInfTo);
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserInfTo userInfTo = threadLocal.get();
        if (!userInfTo.isTempUser()){
            Cookie cookie = new Cookie
                    (CartConstant.TEMP_USER_COOKIE_NAME,userInfTo.getUserKey());
            cookie.setDomain("gulimall.com");
            cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIME_OUT);
            response.addCookie(cookie);
        }
        threadLocal.remove();
    }
}
